It's time to set your comedy ray guns to "stun"--Tuesday through Sunday, the landmark TBS Just for Laughs Chicago festival returns for its fourth annual engagement featuring more than 100 local and national comedians in dozens of stand-up, sketch and specialty shows--many of which are taped for future broadcast--at 18 locations across Chicago, including new-to-the-fest venues UP Comedy Club, Laugh Factory and the Hideout. You can't see them all, and even if you could, a few acts--Aziz Ansari, John Oliver and "The Delocated Witness Protection Program Variety Show"--are sold out. So to help you navigate this behemoth of belly laughs, we've got a "dirty dozen" daily guide featuring our Top 12 national act highlights. For tickets: $25-$48.50 at justforlaughschicago.com and through each venue website. Julia Borcherts is a Redeye special contributor.